Sulfuric Acid → Acenaphtho[1,2-b]quinoxaline-2,5-disulfonic acid

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As represented by the following reaction formula (VII), after 30% fuming sulfuric acid (2.1 L) was added to 300 g of acenaphtho[1,2-b]quinoxaline and the mixture was stirred at room temperature for 24 hours, the resultant was heated to 130° C. and stirred for 32 hours for reaction. While keeping the obtained solution at 40° C. to 50° C., 4.5 L of ion exchange water was added for dilution, and the resultant was further stirred for 3 hours. The precipitate was filtered and recrystallized with sulfuric acid. After being washed with 1 L of acetone for three times, the resultant was filtered and subjected to vacuum drying at 60° C. for 12 hours to obtain acenaphtho[1,2-b]quinoxaline-2,5-disulfonic acid.

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